Abstract
Flow cytometric analysis showed that the treatment of irradiated mice with a heat-killed Lactobacillus casei preparation (LC 9018) accelerated the recovery of granulocytic cell populations in peripheral blood, spleen and femur bone marrow. The recovery of the lymphocytic cell population was not accelerated while the recovery of the B-lymphocytic cell population was inhibited. Histological analysis also showed that the LC-9018 treatment markedly enhanced granulopoiesis in the spleen and bone marrow of irradiated mice. The same LC-9018 treatment significantly increased 30-day survival rates of athymic nude mice after lethal whole-body irradiation. The recovery of the granulocytic cell population in peripheral blood of irradiated athymic nude mice was also accelerated by LC-9018 treatment. Our results suggest that LC 9018 protected lethally irradiated mice from bone marrow death by enhancing granulopoiesis rather than lymphopoiesis and that the contribution of activated T lymphocytes to the enhancement of the granulopoiesis was small.
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